Messages in this thread | | | Date | Sun, 22 Apr 2007 22:11:15 +0200 | From | DervishD <> | Subject | Re: Wrong free clusters count on FAT32 |
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Hi Bodo :)
* Bodo Eggert <7eggert@gmx.de> dixit: > OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> wrote: > >> * Juergen Beisert <juergen127@kreuzholzen.de> dixit: > > >>> So the last free sector count is also stored. When mounting this > >>> filesystem you don't need to walk through the whole FAT to calculate > >>> the available space, you can use this "cached" value instead. And this > >>> cached value seems not to be updated in your portable device. > >> > >> It doesn't, certainly, but Windows doesn't care. Moreover, the > >> device doesn't seem to recalculate the value on every run (unless it > >> does it lightning fast!), so maybe the number is stored elsewhere (the > >> count can be stored in many places as far as I've read, but I don't know > >> the details). > > AFAIR it's stored twice on FAT32, once in a backup sector and once in the > superblock or extended superblock (don't remember, I think it was the > extended ~). It's not stored on FAT{12,16}.
I hadn't noticed the same problem with FAT16 pendrives, so I suspected that. Thanks for confirming :)
Raúl Núñez de Arenas Coronado
-- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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